apple watch EKG app is gone

Thanks for asking about the ECG feature.

Check here for availability in your region: ECG

ECG requires the current non-beta version of iOS and watchOS. For additional help with the ECG feature on your Apple Watch, take a look at these articles.

Heart rate notifications on your Apple Watch - Apple Support

Taking an ECG with the ECG app on Apple Watch Series 4 or later - Apple Support

If you have any other questions, please reach out to our team here: https://apple.co/HeartFeatures. If you believe that you are experiencing a medical emergency, please dial your local emergency services.

Take care.

What is the version of watchOS on your watch?

Did you install the watchOS beta, it does not include the ECG app!

ASC - Late 2012 Mac mini, macOS 10.15.7; Watch, series 5 GPS/cellular, watchOS 7; iPad Pro 2nd Gen, iPadOS 14.0.1; iPad Air 2, iPadOS 14.0.1; iPhone 8+, iOS 14.0.1; TV 4th Gen, tvOS 14.0.2  HomePods, audioOS 14 and Airport Express w/ Airplay 2

ECG app is for apple watch 4 and above.